CFP Forensic Photographer Lighting Techniques & Digital Processing 4

Question 1

Infrared photography is particularly useful in forensic work for which application?

Accepted Answer

Visualizing gunshot residue and writing obliterated by ink on documents

Answer

Infrared penetrates some inks and reveals GSR patterns on dark fabrics because materials reflect and absorb IR differently than visible light.

Question 2

When copying flat evidence such as a document with two light sources, how should the lights be arranged?

Accepted Answer

Two lights at equal 45-degree angles on opposite sides of the document

Answer

Matched 45-degree lights on both sides provide even, glare-free illumination across the entire flat surface.

Question 3

During levels adjustment of a fingerprint image, the examiner clips both the shadow and highlight sliders inward past the data. What is the risk?

Accepted Answer

Ridge detail in the clipped tonal ranges is permanently discarded in the working image

Answer

Clipping discards tonal data, and any ridge detail residing in those ranges is lost from the enhanced working image.

Question 4

Why is a gray card or calibrated color chart photographed at the start of a set of injury photographs?

Accepted Answer

To provide a reference for accurate white balance and color correction of skin and bruising

Answer

A neutral reference lets the examiner correct color casts so bruise coloration is rendered accurately for medical interpretation.

Question 5

A photographer documenting a tool mark uses diffused axial lighting instead of oblique light. When is this the correct choice?

Accepted Answer

When the mark is on a highly reflective curved metal surface prone to hotspots

Answer

Diffused or axial lighting evenly illuminates shiny curved surfaces, avoiding the specular hotspots that oblique light would create.

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